<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <title>基于vue-router的案例</title>
  <style type="text/css">
    .router-link-active {
      background-color: black;
    }

    html,
    body,
    #app {
      margin: 0;
      padding: 0px;
      height: 100%;
    }

    .header {
      height: 50px;
      background-color: #545c64;
      line-height: 50px;
      text-align: center;
      font-size: 24px;
      color: #fff;
    }

    .footer {
      height: 40px;
      line-height: 40px;
      background-color: #888;
      position: absolute;
      bottom: 0;
      width: 100%;
      text-align: center;
      color: #fff;
    }

    .main {
      display: flex;
      position: absolute;
      top: 50px;
      bottom: 40px;
      width: 100%;
    }

    .content {
      flex: 1;
      text-align: center;
      height: 100%;
    }

    .left {
      flex: 0 0 20%;
      background-color: #545c64;
    }

    .left a {
      display: block;
      color: white;
      text-decoration: none;
    }

    .right {
      margin: 5px;
    }

    .btns {
      width: 100%;
      height: 35px;
      line-height: 35px;
      background-color: #f5f5f5;
      text-align: left;
      padding-left: 10px;
      box-sizing: border-box;
    }

    button {
      height: 30px;
      background-color: #ecf5ff;
      border: 1px solid lightskyblue;
      font-size: 12px;
      padding: 0 20px;
    }

    .main-content {
      margin-top: 10px;
    }

    ul {
      margin: 0;
      padding: 0;
      list-style: none;
    }

    ul li {
      height: 45px;
      line-height: 45px;
      background-color: #a0a0a0;
      color: #fff;
      cursor: pointer;
      border-bottom: 1px solid #fff;
    }

    table {
      width: 100%;
      border-collapse: collapse;
    }

    td,
    th {
      border: 1px solid #eee;
      line-height: 35px;
      font-size: 12px;
    }

    th {
      background-color: #ddd;
    }
  </style>
  <script src="js/vue.js"></script>
  <script src="js/vue-router_3.0.2.js"></script>
</head>

<body>
  <div id="app">
    <transition>
      <router-view></router-view>
    </transition>
  </div>


  <script>
    const App = {
      data(){
        return {
          username: ''
        }
      },
      created() {
        this.username = localStorage.getItem('user')
      },
      methods: {
        logout(){
          localStorage.removeItem('user')
          this.$router.push('/login')
        }
      },
      template: `
          <div>
            <!-- 头部区域 -->
            <header class="header">
              传智后台管理系统
              <div v-if="username" style="display: inline; font-size: 12px;margin: 10px;">
                尊贵的会员 {{ username }}，欢迎回来, 
                <a href="javascript:;" @click="logout">退出</a>
              </div>
              <div v-else style="display: inline; font-size: 12px;margin: 10px;">
                <router-link to="/login">登录</router-link>
                <router-link to="/register">注册</router-link>  
              </div>
            </header>
            <!-- 中间主体区域 -->
            <div class="main">
              <!-- 左侧菜单栏 -->
              <div class="content left">
                <ul>
                  <li><router-link to="/user">_用户管理</router-link></li>
                  <li><router-link to="/rights">_权限管理</router-link></li>
                  <li><router-link to="/goods">_商品管理</router-link></li>
                  <li><router-link to="/orders">_订单管理</router-link></li>
                  <li><router-link to="/settings">_系统设置</router-link></li>
                </ul>
              </div>
              <!-- 右侧内容区域 -->
              <div class="content right">
                <div class="main-content">
                  <router-view></router-view>
                </div>
              </div>
            </div>
            <!-- 尾部区域 -->
            <footer class="footer">版权信息</footer>
          </div>
        `
    }

    const User = {
      data() {
        return {
          userList: [
            { id: 1, name: '张三', age: 10 },
            { id: 2, name: '李四', age: 20 },
            { id: 3, name: '王五', age: 30 },
            { id: 4, name: '赵六', age: 40 }
          ]
        }
      },
      template: `
          <div>
            <h3>用户管理区域</h3>
            <table>
            <thead>
              <tr>
                <th>编号</th>
                <th>姓名</th>
                <th>年龄</th>
                <th>操作</th>
              </tr>
            </thead>
            <tbody>
              <tr v-for="item in userList" :key="item.id">
                <td>{{item.id}}</td>
                <td>{{item.name}}</td>
                <td>{{item.age}}</td>
                <td>
                  <a href="javascript:;" @click="getInfo(item.id)">详情</a>
                </td>
              </tr>
            </tbody>
          </table>
          </div>
        `,
      methods: {
        getInfo(id) {
          this.$router.push('/userinfo/' + id)
        }
      },
    }
    const UserInfo = {
      props: ['id'],
      template: `
          <div>
            <h3>用户详情信息 ======= {{id}}</h3>
            <button @click="goBack">返回</button>  
          </div>
        `,
      methods: {
        goBack() {
          this.$router.go(-1)
        }
      }
    }
    const Rights = {
      template: `
          <h3>权限管理区域</h3>
        `,
    }
    const Goods = {
      template: `
          <h3>商品管理区域</h3>
        `,
    }
    const Orders = {
      template: `
          <h3>订单管理区域</h3>
        `,
    }
    const Settings = {
      template: `
          <h3>系统设置区域</h3>
        `,
    }

    const login = {
      data() {
        return {
          username: 'admin',
          pwd: 'admin'
        }
      },
      template: `
        <div>
          <h1>这是登录页面</h1>
          <form @submit.prevent="login">
            <div>
              <label for="username">账号: </label>
              <input type="text" name='username' v-model="username">
            </div>
            <div>
              <label for="pwd">密码: </label>
              <input type="password" name="pwd" v-model="pwd">
            </div>
            <input type="submit" value="登录">          
          </form>
        </div>
      `,
      methods: {
        login() {
          if (this.username == 'admin' && this.pwd == 'admin') {
            localStorage.setItem('user', this.username)
            this.$router.push('/user')
          } else {
            alert('登陆失败，账号或密码错误')
          }
        }
      },
    }
    const register = {
      template: `
        <h1>这是注册页面</h1>
      `,
    }


    const router = new VueRouter({
      routes: [
        {
          path: '/', component: App, redirect: '/user', children: [
            { path: '/user', component: User },
            { path: '/userinfo/:id', component: UserInfo, props: true },
            { path: '/rights', component: Rights },
            { path: '/goods', component: Goods },
            { path: '/orders', component: Orders },
            { path: '/settings', component: Settings },
          ]
        },
        { path: '/login', component: login },
        { path: '/register', component: register }
      ]
    })
    
    router.beforeEach((to, from, next) => {
      let user = localStorage.getItem('user');
      if (to.path == "/login" || to.path == '/register') {
        if(user) {
          return next({ path: "/user" })
        }
        next()
      } else {

        if (!user) {
          alert('请进行登录')
          return next({ path: "/login" })
        }
        next()

      }
    })

    const vm = new Vue({
      el: '#app',
      router
    })


  </script>
</body>

</html>